Work

Pion photoproduction of nucleon excited states with Hamiltonian effective field theory

Year: 2024

Type: article

Abstract: We refine our previous calculation of multipole amplitude E 0 + for pion photoproduction process, γ N → π N . The treatment of final-state interactions is based upon an earlier analysis of pion-nucleon scattering within Hamiltonian effective field theory, supplemented by incorporating contributions from the N * ( 1650 ) and the K Λ coupled channel. The contribution from the bare state corresponding to the N * ( 1650 ) significantly enhances our results. Additionally, we also compute the multipole amplitude M 1 − , which is of direct relevance to the Roper resonance. The results are comparable with other dynamical coupled-channel models, even though the contribution from the bare state (interpreted as a 2 s excitation) in this channel is small because of its large mass. Published by the American Physical Society 2024

Source: Physical review. D/Physical review. D.

DOI: 10.1103/physrevd.110.094015

Authors: Yu Zhuge, Zhan-Wei Liu, Derek B. Leinweber, Anthony W. Thomas

Institutions: Institute of Modern Physics, Lanzhou University, The University of Adelaide

Language: English

Topic: Quantum Chromodynamics and Particle Interactions

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funders: University of Adelaide, National Natural Science Foundation of China, Higher Education Discipline Innovation Project, Australian Research Council